In my opinion, when I first started playing the game (beta and then CE release), the mobs were entirely too easy, I know there has been threads dedicated to battle overall and mobs, but I felt no one has confronted this issue. If you find a thread about mob toughness let me know I'll support that thread to decrease dev confusion.

Mobs are very easy to zerg in this game, the hardest part about mobs are that some have a very damaging tp attack and all mobs have a ranged attack. If you took these two things away the average mob could be zerged down with no penalty. I don't think a complete party wipe tp move is challenging when if they mob doesn't use it...its easy, if you get what I'm saying. An example is Imps, their tp move would wipe a party but other than that tp move they could easily be zerged. With the move to party sizes at max being 8 it could add difficulty to the game, but the mobs have always been lackluster and all around easy.